(19)
(11) EP 1 759 763 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.12.2007 Bulletin 2007/49

(43) Date of publication A2:
07.03.2007 Bulletin 2007/10

(21) Application number: 06017784.7

(22) Date of filing: 25.08.2006
(51) International Patent Classification (IPC): 
B01J 23/63(2006.01)
F01N 3/035(2006.01)
B01J 35/00(2006.01)
B01J 37/03(2006.01)
B01D 53/94(2006.01)
B01J 35/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 05.09.2005 JP 2005256581

(71) Applicant: Mazda Motor Corporation
Aki-gun, Hiroshima 730-8670 (JP)

(72) Inventors:
  • Harada, Koichiro
    Aki-gun Hiroshima 730-8670 (JP)
  • Fujita, Hiroki
    Aki-gun Hiroshima 730-8670 (JP)
  • Okamoto, Kenji
    Aki-gun Hiroshima 730-8670 (JP)
  • Tsushio, Yoshinori
    Aki-gun Hiroshima 730-8670 (JP)
  • Takami, Akihide
    Aki-gun Hiroshima 730-8670 (JP)

(74) Representative: Zinnecker, Armin et al
Lorenz-Seidler-Gossel, Widenmayerstrasse 23
80538 München
80538 München (DE)

   


(54) Exhaust gas purification catalyst and catalyst-equipped diesel particulate filter


(57) To improve the performance of an exhaust gas purification catalyst and enhance the particulate matter burning rate of a catalyst-equipped diesel particulate filter, the catalyst contains a mixed oxide of Zr, at least one kind of rare earth metal other than Ce and precious metal. The rare earth metal is selected from the group of Y, Yb, Nd and Sc. The mixed oxide is obtained by mixing an acidic solution containing Zr ions, ions of at least one kind of rare earth metal other than Ce and precious metal ions with a basic solution to obtain a mixed oxide precursor through coprecipitation and calcining the precursor.





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